Handling of duplicates in clients.conf

[Garber, Neal]

> > Well, assuming by "barf" you mean not start, in 2.0.3 and 2.0.5, the
> > server doesn't barf and the error message only appears when debug is
on
> > (-Xx).  Within the debug, it's closer to the beginning of my output
> > (line 188 of 542 messages).  Here's a very abbreviated example:
> 
>   I think that was fixed in later versions of the server.  The code
now
> looks fine, and it works in my tests.

Awesome!  Thanks for taking the time to test it Alan..  I'll schedule
upgrades of my servers to 2.1.4.